Method for producing lithium-containing solution

Patent metadata

Field	Value
Publication number	US-2023174385-A1
Application number	US-202217923111-A
Country	US
Kind code	A1
Filing date	Mar 30, 2022
Priority date	Mar 31, 2021
Publication date	Jun 8, 2023
Grant date	—

Abstract

Provided is a method for producing a lithium-containing solution that allows increasing a content rate of lithium in a solution after an eluting step, and suppressing an amount of an eluted solution used in a process after the eluting step, thus suppressing production cost of lithium.A method for producing a lithium-containing solution includes an adsorption step of bringing a lithium adsorbent obtained from lithium manganese oxide in contact with a low lithium-containing solution to obtain post-adsorption lithium manganese oxide, an eluting step of bringing the post-adsorption lithium manganese oxide in contact with an acid-containing solution to obtain an eluted solution, and a manganese oxidation step of oxidating manganese to obtain a lithium-containing solution with a suppressed manganese concentration. The adsorption step, the eluting step, and the manganese oxidation step are performed in this order, and the acid-containing solution includes the eluted solution with acid added. The method allows the usage amount of the acid in the eluting step to be suppressed, the content rate of lithium in the eluted solution after the eluting step to be increased, and thus the production cost of the lithium-containing solution to be suppressed.

First claim

1 : A method for producing a lithium-containing solution, comprising:
an adsorption step of bringing a lithium adsorbent obtained from lithium manganese oxide in contact with a low lithium-containing solution to obtain post-adsorption lithium manganese oxide; an eluting step of bringing the post-adsorption lithium manganese oxide in contact with an acid-containing solution to obtain an eluted solution; and a manganese oxidation step of oxidating manganese by adding an oxidant and a pH adjuster to the eluted solution to obtain a lithium-containing solution with a suppressed manganese concentration, wherein the adsorption step, the eluting step, and the manganese oxidation step are performed in this order, and the acid-containing solution includes the eluted solution with acid added.

2 : The method for producing a lithium-containing solution according to claim 1 , wherein
the acid is added such that a hydrogen ion concentration of the acid-containing solution used in the eluting step is 0.1 mol/L or more and 4.0 mol/L or less.

3 : The method for producing a lithium-containing solution according to claim 1 , wherein
the eluted solution is used repeatedly for 5 times or more and 11 times or less in the eluting step.

4 : The method for producing a lithium-containing solution according to claim 2 , wherein
the eluted solution is used repeatedly for 5 times or more and 11 times or less in the eluting step.

Assignees

• Sumitomo Metal Mining Co

Inventors

• Ikeda Osamu
• Takano Masatoshi
• Asano Satoshi
• HEGURI Shin-ichi
• Matsumoto Shin-Ya
• Kudo Yohei
• SENBA Yusuke
• Maeda Kyohei

Classifications

• Y02P10/20

  Recycling · CPC title

• B01J39/10

  Oxides or hydroxides · CPC title

• C22B3/24 Primary

  by adsorption on solid substances, e.g. by extraction with solid resins · CPC title

• C22B3/44

  by chemical processes (treatment or purification of solutions by liquid-liquid extraction C22B3/26, by ion-exchange extraction C22B3/42) · CPC title

• B01J49/53

  for cationic exchangers · CPC title